Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1 | /* |
| 2 | * TI OMAP I2C master mode driver |
| 3 | * |
| 4 | * Copyright (C) 2003 MontaVista Software, Inc. |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 5 | * Copyright (C) 2005 Nokia Corporation |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004 - 2007 Texas Instruments. |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 7 | * |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 8 | * Originally written by MontaVista Software, Inc. |
| 9 | * Additional contributions by: |
| 10 | * Tony Lindgren <tony@atomide.com> |
| 11 | * Imre Deak <imre.deak@nokia.com> |
| 12 | * Juha Yrjölä <juha.yrjola@solidboot.com> |
| 13 | * Syed Khasim <x0khasim@ti.com> |
| 14 | * Nishant Menon <nm@ti.com> |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 15 | * |
| 16 | * This program is free software; you can redistribute it and/or modify |
| 17 | * it under the terms of the GNU General Public License as published by |
| 18 | * the Free Software Foundation; either version 2 of the License, or |
| 19 | * (at your option) any later version. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | * GNU General Public License for more details. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
| 27 | * along with this program; if not, write to the Free Software |
| 28 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 29 | */ |
| 30 | |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/delay.h> |
| 33 | #include <linux/i2c.h> |
| 34 | #include <linux/err.h> |
| 35 | #include <linux/interrupt.h> |
| 36 | #include <linux/completion.h> |
| 37 | #include <linux/platform_device.h> |
| 38 | #include <linux/clk.h> |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 39 | #include <linux/io.h> |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 40 | #include <linux/of.h> |
| 41 | #include <linux/of_i2c.h> |
| 42 | #include <linux/of_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 43 | #include <linux/slab.h> |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 44 | #include <linux/i2c-omap.h> |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 45 | #include <linux/pm_runtime.h> |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 46 | |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 47 | /* I2C controller revisions */ |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 48 | #define OMAP_I2C_OMAP1_REV_2 0x20 |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 49 | |
| 50 | /* I2C controller revisions present on specific hardware */ |
| 51 | #define OMAP_I2C_REV_ON_2430 0x36 |
Jon Hunter | f518b48 | 2012-06-28 20:41:31 +0530 | [diff] [blame] | 52 | #define OMAP_I2C_REV_ON_3430_3530 0x3C |
| 53 | #define OMAP_I2C_REV_ON_3630_4430 0x40 |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 54 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 55 | /* timeout waiting for the controller to respond */ |
| 56 | #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000)) |
| 57 | |
Kalle Jokiniemi | 5043e9e7 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 58 | /* For OMAP3 I2C_IV has changed to I2C_WE (wakeup enable) */ |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 59 | enum { |
| 60 | OMAP_I2C_REV_REG = 0, |
| 61 | OMAP_I2C_IE_REG, |
| 62 | OMAP_I2C_STAT_REG, |
| 63 | OMAP_I2C_IV_REG, |
| 64 | OMAP_I2C_WE_REG, |
| 65 | OMAP_I2C_SYSS_REG, |
| 66 | OMAP_I2C_BUF_REG, |
| 67 | OMAP_I2C_CNT_REG, |
| 68 | OMAP_I2C_DATA_REG, |
| 69 | OMAP_I2C_SYSC_REG, |
| 70 | OMAP_I2C_CON_REG, |
| 71 | OMAP_I2C_OA_REG, |
| 72 | OMAP_I2C_SA_REG, |
| 73 | OMAP_I2C_PSC_REG, |
| 74 | OMAP_I2C_SCLL_REG, |
| 75 | OMAP_I2C_SCLH_REG, |
| 76 | OMAP_I2C_SYSTEST_REG, |
| 77 | OMAP_I2C_BUFSTAT_REG, |
Andy Green | b885308 | 2011-05-30 07:43:04 -0700 | [diff] [blame] | 78 | /* only on OMAP4430 */ |
| 79 | OMAP_I2C_IP_V2_REVNB_LO, |
| 80 | OMAP_I2C_IP_V2_REVNB_HI, |
| 81 | OMAP_I2C_IP_V2_IRQSTATUS_RAW, |
| 82 | OMAP_I2C_IP_V2_IRQENABLE_SET, |
| 83 | OMAP_I2C_IP_V2_IRQENABLE_CLR, |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 84 | }; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 85 | |
| 86 | /* I2C Interrupt Enable Register (OMAP_I2C_IE): */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 87 | #define OMAP_I2C_IE_XDR (1 << 14) /* TX Buffer drain int enable */ |
| 88 | #define OMAP_I2C_IE_RDR (1 << 13) /* RX Buffer drain int enable */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 89 | #define OMAP_I2C_IE_XRDY (1 << 4) /* TX data ready int enable */ |
| 90 | #define OMAP_I2C_IE_RRDY (1 << 3) /* RX data ready int enable */ |
| 91 | #define OMAP_I2C_IE_ARDY (1 << 2) /* Access ready int enable */ |
| 92 | #define OMAP_I2C_IE_NACK (1 << 1) /* No ack interrupt enable */ |
| 93 | #define OMAP_I2C_IE_AL (1 << 0) /* Arbitration lost int ena */ |
| 94 | |
| 95 | /* I2C Status Register (OMAP_I2C_STAT): */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 96 | #define OMAP_I2C_STAT_XDR (1 << 14) /* TX Buffer draining */ |
| 97 | #define OMAP_I2C_STAT_RDR (1 << 13) /* RX Buffer draining */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 98 | #define OMAP_I2C_STAT_BB (1 << 12) /* Bus busy */ |
| 99 | #define OMAP_I2C_STAT_ROVR (1 << 11) /* Receive overrun */ |
| 100 | #define OMAP_I2C_STAT_XUDF (1 << 10) /* Transmit underflow */ |
| 101 | #define OMAP_I2C_STAT_AAS (1 << 9) /* Address as slave */ |
| 102 | #define OMAP_I2C_STAT_AD0 (1 << 8) /* Address zero */ |
| 103 | #define OMAP_I2C_STAT_XRDY (1 << 4) /* Transmit data ready */ |
| 104 | #define OMAP_I2C_STAT_RRDY (1 << 3) /* Receive data ready */ |
| 105 | #define OMAP_I2C_STAT_ARDY (1 << 2) /* Register access ready */ |
| 106 | #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */ |
| 107 | #define OMAP_I2C_STAT_AL (1 << 0) /* Arbitration lost int ena */ |
| 108 | |
Kalle Jokiniemi | 5043e9e7 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 109 | /* I2C WE wakeup enable register */ |
| 110 | #define OMAP_I2C_WE_XDR_WE (1 << 14) /* TX drain wakup */ |
| 111 | #define OMAP_I2C_WE_RDR_WE (1 << 13) /* RX drain wakeup */ |
| 112 | #define OMAP_I2C_WE_AAS_WE (1 << 9) /* Address as slave wakeup*/ |
| 113 | #define OMAP_I2C_WE_BF_WE (1 << 8) /* Bus free wakeup */ |
| 114 | #define OMAP_I2C_WE_STC_WE (1 << 6) /* Start condition wakeup */ |
| 115 | #define OMAP_I2C_WE_GC_WE (1 << 5) /* General call wakeup */ |
| 116 | #define OMAP_I2C_WE_DRDY_WE (1 << 3) /* TX/RX data ready wakeup */ |
| 117 | #define OMAP_I2C_WE_ARDY_WE (1 << 2) /* Reg access ready wakeup */ |
| 118 | #define OMAP_I2C_WE_NACK_WE (1 << 1) /* No acknowledgment wakeup */ |
| 119 | #define OMAP_I2C_WE_AL_WE (1 << 0) /* Arbitration lost wakeup */ |
| 120 | |
| 121 | #define OMAP_I2C_WE_ALL (OMAP_I2C_WE_XDR_WE | OMAP_I2C_WE_RDR_WE | \ |
| 122 | OMAP_I2C_WE_AAS_WE | OMAP_I2C_WE_BF_WE | \ |
| 123 | OMAP_I2C_WE_STC_WE | OMAP_I2C_WE_GC_WE | \ |
| 124 | OMAP_I2C_WE_DRDY_WE | OMAP_I2C_WE_ARDY_WE | \ |
| 125 | OMAP_I2C_WE_NACK_WE | OMAP_I2C_WE_AL_WE) |
| 126 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 127 | /* I2C Buffer Configuration Register (OMAP_I2C_BUF): */ |
| 128 | #define OMAP_I2C_BUF_RDMA_EN (1 << 15) /* RX DMA channel enable */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 129 | #define OMAP_I2C_BUF_RXFIF_CLR (1 << 14) /* RX FIFO Clear */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 130 | #define OMAP_I2C_BUF_XDMA_EN (1 << 7) /* TX DMA channel enable */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 131 | #define OMAP_I2C_BUF_TXFIF_CLR (1 << 6) /* TX FIFO Clear */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 132 | |
| 133 | /* I2C Configuration Register (OMAP_I2C_CON): */ |
| 134 | #define OMAP_I2C_CON_EN (1 << 15) /* I2C module enable */ |
| 135 | #define OMAP_I2C_CON_BE (1 << 14) /* Big endian mode */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 136 | #define OMAP_I2C_CON_OPMODE_HS (1 << 12) /* High Speed support */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 137 | #define OMAP_I2C_CON_STB (1 << 11) /* Start byte mode (master) */ |
| 138 | #define OMAP_I2C_CON_MST (1 << 10) /* Master/slave mode */ |
| 139 | #define OMAP_I2C_CON_TRX (1 << 9) /* TX/RX mode (master only) */ |
| 140 | #define OMAP_I2C_CON_XA (1 << 8) /* Expand address */ |
| 141 | #define OMAP_I2C_CON_RM (1 << 2) /* Repeat mode (master only) */ |
| 142 | #define OMAP_I2C_CON_STP (1 << 1) /* Stop cond (master only) */ |
| 143 | #define OMAP_I2C_CON_STT (1 << 0) /* Start condition (master) */ |
| 144 | |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 145 | /* I2C SCL time value when Master */ |
| 146 | #define OMAP_I2C_SCLL_HSSCLL 8 |
| 147 | #define OMAP_I2C_SCLH_HSSCLH 8 |
| 148 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 149 | /* I2C System Test Register (OMAP_I2C_SYSTEST): */ |
| 150 | #ifdef DEBUG |
| 151 | #define OMAP_I2C_SYSTEST_ST_EN (1 << 15) /* System test enable */ |
| 152 | #define OMAP_I2C_SYSTEST_FREE (1 << 14) /* Free running mode */ |
| 153 | #define OMAP_I2C_SYSTEST_TMODE_MASK (3 << 12) /* Test mode select */ |
| 154 | #define OMAP_I2C_SYSTEST_TMODE_SHIFT (12) /* Test mode select */ |
| 155 | #define OMAP_I2C_SYSTEST_SCL_I (1 << 3) /* SCL line sense in */ |
| 156 | #define OMAP_I2C_SYSTEST_SCL_O (1 << 2) /* SCL line drive out */ |
| 157 | #define OMAP_I2C_SYSTEST_SDA_I (1 << 1) /* SDA line sense in */ |
| 158 | #define OMAP_I2C_SYSTEST_SDA_O (1 << 0) /* SDA line drive out */ |
| 159 | #endif |
| 160 | |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 161 | /* OCP_SYSSTATUS bit definitions */ |
| 162 | #define SYSS_RESETDONE_MASK (1 << 0) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 163 | |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 164 | /* OCP_SYSCONFIG bit definitions */ |
| 165 | #define SYSC_CLOCKACTIVITY_MASK (0x3 << 8) |
| 166 | #define SYSC_SIDLEMODE_MASK (0x3 << 3) |
| 167 | #define SYSC_ENAWAKEUP_MASK (1 << 2) |
| 168 | #define SYSC_SOFTRESET_MASK (1 << 1) |
| 169 | #define SYSC_AUTOIDLE_MASK (1 << 0) |
| 170 | |
| 171 | #define SYSC_IDLEMODE_SMART 0x2 |
| 172 | #define SYSC_CLOCKACTIVITY_FCLK 0x2 |
| 173 | |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 174 | /* Errata definitions */ |
| 175 | #define I2C_OMAP_ERRATA_I207 (1 << 0) |
Shubhrajyoti D | c8db38f | 2012-05-29 16:26:22 +0530 | [diff] [blame] | 176 | #define I2C_OMAP_ERRATA_I462 (1 << 1) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 177 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 178 | struct omap_i2c_dev { |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 179 | spinlock_t lock; /* IRQ synchronization */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 180 | struct device *dev; |
| 181 | void __iomem *base; /* virtual */ |
| 182 | int irq; |
Cory Maccarrone | d84d3ea | 2009-12-12 17:54:02 -0800 | [diff] [blame] | 183 | int reg_shift; /* bit shift for I2C register addresses */ |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 184 | struct completion cmd_complete; |
| 185 | struct resource *ioarea; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 186 | u32 latency; /* maximum mpu wkup latency */ |
| 187 | void (*set_mpu_wkup_lat)(struct device *dev, |
| 188 | long latency); |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 189 | u32 speed; /* Speed of bus in kHz */ |
| 190 | u32 dtrev; /* extra revision from DT */ |
| 191 | u32 flags; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 192 | u16 cmd_err; |
| 193 | u8 *buf; |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 194 | u8 *regs; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 195 | size_t buf_len; |
| 196 | struct i2c_adapter adapter; |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 197 | u8 threshold; |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 198 | u8 fifo_size; /* use as flag and value |
| 199 | * fifo_size==0 implies no fifo |
| 200 | * if set, should be trsh+1 |
| 201 | */ |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 202 | u8 rev; |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 203 | unsigned b_hw:1; /* bad h/w fixes */ |
Felipe Balbi | 079d8af | 2012-09-12 16:28:06 +0530 | [diff] [blame] | 204 | unsigned receiver:1; /* true when we're in receiver mode */ |
Tony Lindgren | f08ac4e | 2008-03-23 20:28:20 +0100 | [diff] [blame] | 205 | u16 iestate; /* Saved interrupt register */ |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 206 | u16 pscstate; |
| 207 | u16 scllstate; |
| 208 | u16 sclhstate; |
| 209 | u16 bufstate; |
| 210 | u16 syscstate; |
| 211 | u16 westate; |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 212 | u16 errata; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 213 | }; |
| 214 | |
Andy Green | a129557 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 215 | static const u8 reg_map_ip_v1[] = { |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 216 | [OMAP_I2C_REV_REG] = 0x00, |
| 217 | [OMAP_I2C_IE_REG] = 0x01, |
| 218 | [OMAP_I2C_STAT_REG] = 0x02, |
| 219 | [OMAP_I2C_IV_REG] = 0x03, |
| 220 | [OMAP_I2C_WE_REG] = 0x03, |
| 221 | [OMAP_I2C_SYSS_REG] = 0x04, |
| 222 | [OMAP_I2C_BUF_REG] = 0x05, |
| 223 | [OMAP_I2C_CNT_REG] = 0x06, |
| 224 | [OMAP_I2C_DATA_REG] = 0x07, |
| 225 | [OMAP_I2C_SYSC_REG] = 0x08, |
| 226 | [OMAP_I2C_CON_REG] = 0x09, |
| 227 | [OMAP_I2C_OA_REG] = 0x0a, |
| 228 | [OMAP_I2C_SA_REG] = 0x0b, |
| 229 | [OMAP_I2C_PSC_REG] = 0x0c, |
| 230 | [OMAP_I2C_SCLL_REG] = 0x0d, |
| 231 | [OMAP_I2C_SCLH_REG] = 0x0e, |
| 232 | [OMAP_I2C_SYSTEST_REG] = 0x0f, |
| 233 | [OMAP_I2C_BUFSTAT_REG] = 0x10, |
| 234 | }; |
| 235 | |
Andy Green | a129557 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 236 | static const u8 reg_map_ip_v2[] = { |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 237 | [OMAP_I2C_REV_REG] = 0x04, |
| 238 | [OMAP_I2C_IE_REG] = 0x2c, |
| 239 | [OMAP_I2C_STAT_REG] = 0x28, |
| 240 | [OMAP_I2C_IV_REG] = 0x34, |
| 241 | [OMAP_I2C_WE_REG] = 0x34, |
| 242 | [OMAP_I2C_SYSS_REG] = 0x90, |
| 243 | [OMAP_I2C_BUF_REG] = 0x94, |
| 244 | [OMAP_I2C_CNT_REG] = 0x98, |
| 245 | [OMAP_I2C_DATA_REG] = 0x9c, |
Alexander Aring | 2727b17 | 2011-12-08 15:43:53 +0100 | [diff] [blame] | 246 | [OMAP_I2C_SYSC_REG] = 0x10, |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 247 | [OMAP_I2C_CON_REG] = 0xa4, |
| 248 | [OMAP_I2C_OA_REG] = 0xa8, |
| 249 | [OMAP_I2C_SA_REG] = 0xac, |
| 250 | [OMAP_I2C_PSC_REG] = 0xb0, |
| 251 | [OMAP_I2C_SCLL_REG] = 0xb4, |
| 252 | [OMAP_I2C_SCLH_REG] = 0xb8, |
| 253 | [OMAP_I2C_SYSTEST_REG] = 0xbC, |
| 254 | [OMAP_I2C_BUFSTAT_REG] = 0xc0, |
Andy Green | b885308 | 2011-05-30 07:43:04 -0700 | [diff] [blame] | 255 | [OMAP_I2C_IP_V2_REVNB_LO] = 0x00, |
| 256 | [OMAP_I2C_IP_V2_REVNB_HI] = 0x04, |
| 257 | [OMAP_I2C_IP_V2_IRQSTATUS_RAW] = 0x24, |
| 258 | [OMAP_I2C_IP_V2_IRQENABLE_SET] = 0x2c, |
| 259 | [OMAP_I2C_IP_V2_IRQENABLE_CLR] = 0x30, |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 260 | }; |
| 261 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 262 | static inline void omap_i2c_write_reg(struct omap_i2c_dev *i2c_dev, |
| 263 | int reg, u16 val) |
| 264 | { |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 265 | __raw_writew(val, i2c_dev->base + |
| 266 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | static inline u16 omap_i2c_read_reg(struct omap_i2c_dev *i2c_dev, int reg) |
| 270 | { |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 271 | return __raw_readw(i2c_dev->base + |
| 272 | (i2c_dev->regs[reg] << i2c_dev->reg_shift)); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 273 | } |
| 274 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 275 | static int omap_i2c_init(struct omap_i2c_dev *dev) |
| 276 | { |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 277 | u16 psc = 0, scll = 0, sclh = 0, buf = 0; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 278 | u16 fsscll = 0, fssclh = 0, hsscll = 0, hssclh = 0; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 279 | unsigned long fclk_rate = 12000000; |
| 280 | unsigned long timeout; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 281 | unsigned long internal_clk = 0; |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 282 | struct clk *fclk; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 283 | |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 284 | if (dev->rev >= OMAP_I2C_OMAP1_REV_2) { |
Manjunatha GK | 57eb81b | 2009-12-11 11:09:08 +0530 | [diff] [blame] | 285 | /* Disable I2C controller before soft reset */ |
| 286 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, |
| 287 | omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & |
| 288 | ~(OMAP_I2C_CON_EN)); |
| 289 | |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 290 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, SYSC_SOFTRESET_MASK); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 291 | /* For some reason we need to set the EN bit before the |
| 292 | * reset done bit gets set. */ |
| 293 | timeout = jiffies + OMAP_I2C_TIMEOUT; |
| 294 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); |
| 295 | while (!(omap_i2c_read_reg(dev, OMAP_I2C_SYSS_REG) & |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 296 | SYSS_RESETDONE_MASK)) { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 297 | if (time_after(jiffies, timeout)) { |
Joe Perches | fce3ff0 | 2007-12-12 13:45:24 +0100 | [diff] [blame] | 298 | dev_warn(dev->dev, "timeout waiting " |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 299 | "for controller reset\n"); |
| 300 | return -ETIMEDOUT; |
| 301 | } |
| 302 | msleep(1); |
| 303 | } |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 304 | |
| 305 | /* SYSC register is cleared by the reset; rewrite it */ |
| 306 | if (dev->rev == OMAP_I2C_REV_ON_2430) { |
| 307 | |
| 308 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, |
| 309 | SYSC_AUTOIDLE_MASK); |
| 310 | |
Jon Hunter | f518b48 | 2012-06-28 20:41:31 +0530 | [diff] [blame] | 311 | } else if (dev->rev >= OMAP_I2C_REV_ON_3430_3530) { |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 312 | dev->syscstate = SYSC_AUTOIDLE_MASK; |
| 313 | dev->syscstate |= SYSC_ENAWAKEUP_MASK; |
| 314 | dev->syscstate |= (SYSC_IDLEMODE_SMART << |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 315 | __ffs(SYSC_SIDLEMODE_MASK)); |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 316 | dev->syscstate |= (SYSC_CLOCKACTIVITY_FCLK << |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 317 | __ffs(SYSC_CLOCKACTIVITY_MASK)); |
| 318 | |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 319 | omap_i2c_write_reg(dev, OMAP_I2C_SYSC_REG, |
| 320 | dev->syscstate); |
Kalle Jokiniemi | 5043e9e7 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 321 | /* |
| 322 | * Enabling all wakup sources to stop I2C freezing on |
| 323 | * WFI instruction. |
| 324 | * REVISIT: Some wkup sources might not be needed. |
| 325 | */ |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 326 | dev->westate = OMAP_I2C_WE_ALL; |
Shubhrajyoti D | cb28e58 | 2011-08-03 13:58:08 +0530 | [diff] [blame] | 327 | omap_i2c_write_reg(dev, OMAP_I2C_WE_REG, |
| 328 | dev->westate); |
Paul Walmsley | fdd07fe | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 329 | } |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 330 | } |
| 331 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
| 332 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 333 | if (dev->flags & OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK) { |
Russell King | 0e9ae10 | 2009-01-22 19:31:46 +0000 | [diff] [blame] | 334 | /* |
| 335 | * The I2C functional clock is the armxor_ck, so there's |
| 336 | * no need to get "armxor_ck" separately. Now, if OMAP2420 |
| 337 | * always returns 12MHz for the functional clock, we can |
| 338 | * do this bit unconditionally. |
| 339 | */ |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 340 | fclk = clk_get(dev->dev, "fck"); |
| 341 | fclk_rate = clk_get_rate(fclk); |
| 342 | clk_put(fclk); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 343 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 344 | /* TRM for 5912 says the I2C clock must be prescaled to be |
| 345 | * between 7 - 12 MHz. The XOR input clock is typically |
| 346 | * 12, 13 or 19.2 MHz. So we should have code that produces: |
| 347 | * |
| 348 | * XOR MHz Divider Prescaler |
| 349 | * 12 1 0 |
| 350 | * 13 2 1 |
| 351 | * 19.2 2 1 |
| 352 | */ |
Jean Delvare | d7aef13 | 2006-12-10 21:21:34 +0100 | [diff] [blame] | 353 | if (fclk_rate > 12000000) |
| 354 | psc = fclk_rate / 12000000; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 355 | } |
| 356 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 357 | if (!(dev->flags & OMAP_I2C_FLAG_SIMPLE_CLOCK)) { |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 358 | |
Aaro Koskinen | 84bf2c8 | 2009-05-27 17:54:46 +0300 | [diff] [blame] | 359 | /* |
| 360 | * HSI2C controller internal clk rate should be 19.2 Mhz for |
| 361 | * HS and for all modes on 2430. On 34xx we can use lower rate |
| 362 | * to get longer filter period for better noise suppression. |
| 363 | * The filter is iclk (fclk for HS) period. |
| 364 | */ |
Andy Green | 3be0053 | 2011-05-30 07:43:09 -0700 | [diff] [blame] | 365 | if (dev->speed > 400 || |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 366 | dev->flags & OMAP_I2C_FLAG_FORCE_19200_INT_CLK) |
Aaro Koskinen | 84bf2c8 | 2009-05-27 17:54:46 +0300 | [diff] [blame] | 367 | internal_clk = 19200; |
| 368 | else if (dev->speed > 100) |
| 369 | internal_clk = 9600; |
| 370 | else |
| 371 | internal_clk = 4000; |
Rajendra Nayak | 27b1fec | 2010-09-28 21:02:58 +0530 | [diff] [blame] | 372 | fclk = clk_get(dev->dev, "fck"); |
| 373 | fclk_rate = clk_get_rate(fclk) / 1000; |
| 374 | clk_put(fclk); |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 375 | |
| 376 | /* Compute prescaler divisor */ |
| 377 | psc = fclk_rate / internal_clk; |
| 378 | psc = psc - 1; |
| 379 | |
| 380 | /* If configured for High Speed */ |
| 381 | if (dev->speed > 400) { |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 382 | unsigned long scl; |
| 383 | |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 384 | /* For first phase of HS mode */ |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 385 | scl = internal_clk / 400; |
| 386 | fsscll = scl - (scl / 3) - 7; |
| 387 | fssclh = (scl / 3) - 5; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 388 | |
| 389 | /* For second phase of HS mode */ |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 390 | scl = fclk_rate / dev->speed; |
| 391 | hsscll = scl - (scl / 3) - 7; |
| 392 | hssclh = (scl / 3) - 5; |
| 393 | } else if (dev->speed > 100) { |
| 394 | unsigned long scl; |
| 395 | |
| 396 | /* Fast mode */ |
| 397 | scl = internal_clk / dev->speed; |
| 398 | fsscll = scl - (scl / 3) - 7; |
| 399 | fssclh = (scl / 3) - 5; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 400 | } else { |
Aaro Koskinen | baf46b4 | 2009-05-27 17:54:45 +0300 | [diff] [blame] | 401 | /* Standard mode */ |
| 402 | fsscll = internal_clk / (dev->speed * 2) - 7; |
| 403 | fssclh = internal_clk / (dev->speed * 2) - 5; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 404 | } |
| 405 | scll = (hsscll << OMAP_I2C_SCLL_HSSCLL) | fsscll; |
| 406 | sclh = (hssclh << OMAP_I2C_SCLH_HSSCLH) | fssclh; |
| 407 | } else { |
| 408 | /* Program desired operating rate */ |
| 409 | fclk_rate /= (psc + 1) * 1000; |
| 410 | if (psc > 2) |
| 411 | psc = 2; |
| 412 | scll = fclk_rate / (dev->speed * 2) - 7 + psc; |
| 413 | sclh = fclk_rate / (dev->speed * 2) - 7 + psc; |
| 414 | } |
| 415 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 416 | /* Setup clock prescaler to obtain approx 12MHz I2C module clock: */ |
| 417 | omap_i2c_write_reg(dev, OMAP_I2C_PSC_REG, psc); |
| 418 | |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 419 | /* SCL low and high time values */ |
| 420 | omap_i2c_write_reg(dev, OMAP_I2C_SCLL_REG, scll); |
| 421 | omap_i2c_write_reg(dev, OMAP_I2C_SCLH_REG, sclh); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 422 | |
| 423 | /* Take the I2C module out of reset: */ |
| 424 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); |
| 425 | |
| 426 | /* Enable interrupts */ |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 427 | dev->iestate = (OMAP_I2C_IE_XRDY | OMAP_I2C_IE_RRDY | |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 428 | OMAP_I2C_IE_ARDY | OMAP_I2C_IE_NACK | |
| 429 | OMAP_I2C_IE_AL) | ((dev->fifo_size) ? |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 430 | (OMAP_I2C_IE_RDR | OMAP_I2C_IE_XDR) : 0); |
| 431 | omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate); |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 432 | if (dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { |
Rajendra Nayak | ef87143 | 2009-11-23 08:59:18 -0800 | [diff] [blame] | 433 | dev->pscstate = psc; |
| 434 | dev->scllstate = scll; |
| 435 | dev->sclhstate = sclh; |
| 436 | dev->bufstate = buf; |
| 437 | } |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 438 | return 0; |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Waiting on Bus Busy |
| 443 | */ |
| 444 | static int omap_i2c_wait_for_bb(struct omap_i2c_dev *dev) |
| 445 | { |
| 446 | unsigned long timeout; |
| 447 | |
| 448 | timeout = jiffies + OMAP_I2C_TIMEOUT; |
| 449 | while (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) & OMAP_I2C_STAT_BB) { |
| 450 | if (time_after(jiffies, timeout)) { |
| 451 | dev_warn(dev->dev, "timeout waiting for bus ready\n"); |
| 452 | return -ETIMEDOUT; |
| 453 | } |
| 454 | msleep(1); |
| 455 | } |
| 456 | |
| 457 | return 0; |
| 458 | } |
| 459 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 460 | static void omap_i2c_resize_fifo(struct omap_i2c_dev *dev, u8 size, bool is_rx) |
| 461 | { |
| 462 | u16 buf; |
| 463 | |
| 464 | if (dev->flags & OMAP_I2C_FLAG_NO_FIFO) |
| 465 | return; |
| 466 | |
| 467 | /* |
| 468 | * Set up notification threshold based on message size. We're doing |
| 469 | * this to try and avoid draining feature as much as possible. Whenever |
| 470 | * we have big messages to transfer (bigger than our total fifo size) |
| 471 | * then we might use draining feature to transfer the remaining bytes. |
| 472 | */ |
| 473 | |
| 474 | dev->threshold = clamp(size, (u8) 1, dev->fifo_size); |
| 475 | |
| 476 | buf = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); |
| 477 | |
| 478 | if (is_rx) { |
| 479 | /* Clear RX Threshold */ |
| 480 | buf &= ~(0x3f << 8); |
| 481 | buf |= ((dev->threshold - 1) << 8) | OMAP_I2C_BUF_RXFIF_CLR; |
| 482 | } else { |
| 483 | /* Clear TX Threshold */ |
| 484 | buf &= ~0x3f; |
| 485 | buf |= (dev->threshold - 1) | OMAP_I2C_BUF_TXFIF_CLR; |
| 486 | } |
| 487 | |
| 488 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, buf); |
| 489 | |
| 490 | if (dev->rev < OMAP_I2C_REV_ON_3630_4430) |
| 491 | dev->b_hw = 1; /* Enable hardware fixes */ |
| 492 | |
| 493 | /* calculate wakeup latency constraint for MPU */ |
| 494 | if (dev->set_mpu_wkup_lat != NULL) |
| 495 | dev->latency = (1000000 * dev->threshold) / |
| 496 | (1000 * dev->speed / 8); |
| 497 | } |
| 498 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 499 | /* |
| 500 | * Low level master read/write transaction. |
| 501 | */ |
| 502 | static int omap_i2c_xfer_msg(struct i2c_adapter *adap, |
| 503 | struct i2c_msg *msg, int stop) |
| 504 | { |
| 505 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); |
Shubhrajyoti D | 33d5498 | 2012-05-29 16:26:17 +0530 | [diff] [blame] | 506 | unsigned long timeout; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 507 | u16 w; |
| 508 | |
| 509 | dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n", |
| 510 | msg->addr, msg->len, msg->flags, stop); |
| 511 | |
| 512 | if (msg->len == 0) |
| 513 | return -EINVAL; |
| 514 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 515 | dev->receiver = !!(msg->flags & I2C_M_RD); |
| 516 | omap_i2c_resize_fifo(dev, msg->len, dev->receiver); |
| 517 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 518 | omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr); |
| 519 | |
| 520 | /* REVISIT: Could the STB bit of I2C_CON be used with probing? */ |
| 521 | dev->buf = msg->buf; |
| 522 | dev->buf_len = msg->len; |
| 523 | |
| 524 | omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len); |
| 525 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 526 | /* Clear the FIFO Buffers */ |
| 527 | w = omap_i2c_read_reg(dev, OMAP_I2C_BUF_REG); |
| 528 | w |= OMAP_I2C_BUF_RXFIF_CLR | OMAP_I2C_BUF_TXFIF_CLR; |
| 529 | omap_i2c_write_reg(dev, OMAP_I2C_BUF_REG, w); |
| 530 | |
Shubhrajyoti D | 0e33bbb | 2012-06-28 20:41:29 +0530 | [diff] [blame] | 531 | INIT_COMPLETION(dev->cmd_complete); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 532 | dev->cmd_err = 0; |
| 533 | |
| 534 | w = OMAP_I2C_CON_EN | OMAP_I2C_CON_MST | OMAP_I2C_CON_STT; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 535 | |
| 536 | /* High speed configuration */ |
| 537 | if (dev->speed > 400) |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 538 | w |= OMAP_I2C_CON_OPMODE_HS; |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 539 | |
Laurent Pinchart | fb604a3 | 2012-07-24 14:13:59 +0200 | [diff] [blame] | 540 | if (msg->flags & I2C_M_STOP) |
| 541 | stop = 1; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 542 | if (msg->flags & I2C_M_TEN) |
| 543 | w |= OMAP_I2C_CON_XA; |
| 544 | if (!(msg->flags & I2C_M_RD)) |
| 545 | w |= OMAP_I2C_CON_TRX; |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 546 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 547 | if (!dev->b_hw && stop) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 548 | w |= OMAP_I2C_CON_STP; |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 549 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 550 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
| 551 | |
Jarkko Nikula | b7af349 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 552 | /* |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 553 | * Don't write stt and stp together on some hardware. |
| 554 | */ |
| 555 | if (dev->b_hw && stop) { |
| 556 | unsigned long delay = jiffies + OMAP_I2C_TIMEOUT; |
| 557 | u16 con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); |
| 558 | while (con & OMAP_I2C_CON_STT) { |
| 559 | con = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); |
| 560 | |
| 561 | /* Let the user know if i2c is in a bad state */ |
| 562 | if (time_after(jiffies, delay)) { |
| 563 | dev_err(dev->dev, "controller timed out " |
| 564 | "waiting for start condition to finish\n"); |
| 565 | return -ETIMEDOUT; |
| 566 | } |
| 567 | cpu_relax(); |
| 568 | } |
| 569 | |
| 570 | w |= OMAP_I2C_CON_STP; |
| 571 | w &= ~OMAP_I2C_CON_STT; |
| 572 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
| 573 | } |
| 574 | |
| 575 | /* |
Jarkko Nikula | b7af349 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 576 | * REVISIT: We should abort the transfer on signals, but the bus goes |
| 577 | * into arbitration and we're currently unable to recover from it. |
| 578 | */ |
Shubhrajyoti D | 33d5498 | 2012-05-29 16:26:17 +0530 | [diff] [blame] | 579 | timeout = wait_for_completion_timeout(&dev->cmd_complete, |
| 580 | OMAP_I2C_TIMEOUT); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 581 | dev->buf_len = 0; |
Shubhrajyoti D | 33d5498 | 2012-05-29 16:26:17 +0530 | [diff] [blame] | 582 | if (timeout == 0) { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 583 | dev_err(dev->dev, "controller timed out\n"); |
| 584 | omap_i2c_init(dev); |
| 585 | return -ETIMEDOUT; |
| 586 | } |
| 587 | |
| 588 | if (likely(!dev->cmd_err)) |
| 589 | return 0; |
| 590 | |
| 591 | /* We have an error */ |
| 592 | if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR | |
| 593 | OMAP_I2C_STAT_XUDF)) { |
| 594 | omap_i2c_init(dev); |
| 595 | return -EIO; |
| 596 | } |
| 597 | |
| 598 | if (dev->cmd_err & OMAP_I2C_STAT_NACK) { |
| 599 | if (msg->flags & I2C_M_IGNORE_NAK) |
| 600 | return 0; |
| 601 | if (stop) { |
| 602 | w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); |
| 603 | w |= OMAP_I2C_CON_STP; |
| 604 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); |
| 605 | } |
| 606 | return -EREMOTEIO; |
| 607 | } |
| 608 | return -EIO; |
| 609 | } |
| 610 | |
| 611 | |
| 612 | /* |
| 613 | * Prepare controller for a transaction and call omap_i2c_xfer_msg |
| 614 | * to do the work during IRQ processing. |
| 615 | */ |
| 616 | static int |
| 617 | omap_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) |
| 618 | { |
| 619 | struct omap_i2c_dev *dev = i2c_get_adapdata(adap); |
| 620 | int i; |
| 621 | int r; |
| 622 | |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 623 | r = pm_runtime_get_sync(dev->dev); |
| 624 | if (IS_ERR_VALUE(r)) |
Kevin Hilman | 33ec5e8 | 2012-06-26 18:45:32 -0700 | [diff] [blame] | 625 | goto out; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 626 | |
Tony Lindgren | c1a473b | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 627 | r = omap_i2c_wait_for_bb(dev); |
| 628 | if (r < 0) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 629 | goto out; |
| 630 | |
Samu Onkalo | 6a91b55 | 2010-11-18 12:04:20 +0200 | [diff] [blame] | 631 | if (dev->set_mpu_wkup_lat != NULL) |
| 632 | dev->set_mpu_wkup_lat(dev->dev, dev->latency); |
| 633 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 634 | for (i = 0; i < num; i++) { |
| 635 | r = omap_i2c_xfer_msg(adap, &msgs[i], (i == (num - 1))); |
| 636 | if (r != 0) |
| 637 | break; |
| 638 | } |
| 639 | |
Samu Onkalo | 6a91b55 | 2010-11-18 12:04:20 +0200 | [diff] [blame] | 640 | if (dev->set_mpu_wkup_lat != NULL) |
| 641 | dev->set_mpu_wkup_lat(dev->dev, -1); |
| 642 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 643 | if (r == 0) |
| 644 | r = num; |
Mathias Nyman | 5c64eb2 | 2010-08-26 07:36:44 +0000 | [diff] [blame] | 645 | |
| 646 | omap_i2c_wait_for_bb(dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 647 | out: |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 648 | pm_runtime_put(dev->dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 649 | return r; |
| 650 | } |
| 651 | |
| 652 | static u32 |
| 653 | omap_i2c_func(struct i2c_adapter *adap) |
| 654 | { |
Laurent Pinchart | fb604a3 | 2012-07-24 14:13:59 +0200 | [diff] [blame] | 655 | return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK) | |
| 656 | I2C_FUNC_PROTOCOL_MANGLING; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 657 | } |
| 658 | |
| 659 | static inline void |
| 660 | omap_i2c_complete_cmd(struct omap_i2c_dev *dev, u16 err) |
| 661 | { |
| 662 | dev->cmd_err |= err; |
| 663 | complete(&dev->cmd_complete); |
| 664 | } |
| 665 | |
| 666 | static inline void |
| 667 | omap_i2c_ack_stat(struct omap_i2c_dev *dev, u16 stat) |
| 668 | { |
| 669 | omap_i2c_write_reg(dev, OMAP_I2C_STAT_REG, stat); |
| 670 | } |
| 671 | |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 672 | static inline void i2c_omap_errata_i207(struct omap_i2c_dev *dev, u16 stat) |
| 673 | { |
| 674 | /* |
| 675 | * I2C Errata(Errata Nos. OMAP2: 1.67, OMAP3: 1.8) |
| 676 | * Not applicable for OMAP4. |
| 677 | * Under certain rare conditions, RDR could be set again |
| 678 | * when the bus is busy, then ignore the interrupt and |
| 679 | * clear the interrupt. |
| 680 | */ |
| 681 | if (stat & OMAP_I2C_STAT_RDR) { |
| 682 | /* Step 1: If RDR is set, clear it */ |
| 683 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
| 684 | |
| 685 | /* Step 2: */ |
| 686 | if (!(omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) |
| 687 | & OMAP_I2C_STAT_BB)) { |
| 688 | |
| 689 | /* Step 3: */ |
| 690 | if (omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG) |
| 691 | & OMAP_I2C_STAT_RDR) { |
| 692 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
| 693 | dev_dbg(dev->dev, "RDR when bus is busy.\n"); |
| 694 | } |
| 695 | |
| 696 | } |
| 697 | } |
| 698 | } |
| 699 | |
Paul Walmsley | 43469d8e | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 700 | /* rev1 devices are apparently only on some 15xx */ |
| 701 | #ifdef CONFIG_ARCH_OMAP15XX |
| 702 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 703 | static irqreturn_t |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 704 | omap_i2c_omap1_isr(int this_irq, void *dev_id) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 705 | { |
| 706 | struct omap_i2c_dev *dev = dev_id; |
| 707 | u16 iv, w; |
| 708 | |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 709 | if (pm_runtime_suspended(dev->dev)) |
Tony Lindgren | f08ac4e | 2008-03-23 20:28:20 +0100 | [diff] [blame] | 710 | return IRQ_NONE; |
| 711 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 712 | iv = omap_i2c_read_reg(dev, OMAP_I2C_IV_REG); |
| 713 | switch (iv) { |
| 714 | case 0x00: /* None */ |
| 715 | break; |
| 716 | case 0x01: /* Arbitration lost */ |
| 717 | dev_err(dev->dev, "Arbitration lost\n"); |
| 718 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_AL); |
| 719 | break; |
| 720 | case 0x02: /* No acknowledgement */ |
| 721 | omap_i2c_complete_cmd(dev, OMAP_I2C_STAT_NACK); |
| 722 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_STP); |
| 723 | break; |
| 724 | case 0x03: /* Register access ready */ |
| 725 | omap_i2c_complete_cmd(dev, 0); |
| 726 | break; |
| 727 | case 0x04: /* Receive data ready */ |
| 728 | if (dev->buf_len) { |
| 729 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); |
| 730 | *dev->buf++ = w; |
| 731 | dev->buf_len--; |
| 732 | if (dev->buf_len) { |
| 733 | *dev->buf++ = w >> 8; |
| 734 | dev->buf_len--; |
| 735 | } |
| 736 | } else |
| 737 | dev_err(dev->dev, "RRDY IRQ while no data requested\n"); |
| 738 | break; |
| 739 | case 0x05: /* Transmit data ready */ |
| 740 | if (dev->buf_len) { |
| 741 | w = *dev->buf++; |
| 742 | dev->buf_len--; |
| 743 | if (dev->buf_len) { |
| 744 | w |= *dev->buf++ << 8; |
| 745 | dev->buf_len--; |
| 746 | } |
| 747 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); |
| 748 | } else |
| 749 | dev_err(dev->dev, "XRDY IRQ while no data to send\n"); |
| 750 | break; |
| 751 | default: |
| 752 | return IRQ_NONE; |
| 753 | } |
| 754 | |
| 755 | return IRQ_HANDLED; |
| 756 | } |
Paul Walmsley | 43469d8e | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 757 | #else |
Andy Green | 4e80f72 | 2011-05-30 07:43:07 -0700 | [diff] [blame] | 758 | #define omap_i2c_omap1_isr NULL |
Paul Walmsley | 43469d8e | 2008-11-21 13:39:47 -0800 | [diff] [blame] | 759 | #endif |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 760 | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 761 | /* |
Shubhrajyoti D | c8db38f | 2012-05-29 16:26:22 +0530 | [diff] [blame] | 762 | * OMAP3430 Errata i462: When an XRDY/XDR is hit, wait for XUDF before writing |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 763 | * data to DATA_REG. Otherwise some data bytes can be lost while transferring |
| 764 | * them from the memory to the I2C interface. |
| 765 | */ |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 766 | static int errata_omap3_i462(struct omap_i2c_dev *dev) |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 767 | { |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 768 | unsigned long timeout = 10000; |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 769 | u16 stat; |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 770 | |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 771 | do { |
| 772 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 773 | if (stat & OMAP_I2C_STAT_XUDF) |
| 774 | break; |
| 775 | |
| 776 | if (stat & (OMAP_I2C_STAT_NACK | OMAP_I2C_STAT_AL)) { |
Felipe Balbi | 540a479 | 2012-09-12 16:27:59 +0530 | [diff] [blame] | 777 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_XRDY | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 778 | OMAP_I2C_STAT_XDR)); |
Felipe Balbi | b07be0f | 2012-09-12 16:28:11 +0530 | [diff] [blame] | 779 | if (stat & OMAP_I2C_STAT_NACK) { |
| 780 | dev->cmd_err |= OMAP_I2C_STAT_NACK; |
| 781 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
| 782 | } |
| 783 | |
| 784 | if (stat & OMAP_I2C_STAT_AL) { |
| 785 | dev_err(dev->dev, "Arbitration lost\n"); |
| 786 | dev->cmd_err |= OMAP_I2C_STAT_AL; |
| 787 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
| 788 | } |
| 789 | |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 790 | return -EIO; |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 791 | } |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 792 | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 793 | cpu_relax(); |
Felipe Balbi | 4151e74 | 2012-09-12 16:28:01 +0530 | [diff] [blame] | 794 | } while (--timeout); |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 795 | |
Alexander Shishkin | e9f59b9 | 2010-05-11 11:35:17 -0700 | [diff] [blame] | 796 | if (!timeout) { |
| 797 | dev_err(dev->dev, "timeout waiting on XUDF bit\n"); |
| 798 | return 0; |
| 799 | } |
| 800 | |
Alexander Shishkin | 2dd151a | 2010-05-11 11:35:14 -0700 | [diff] [blame] | 801 | return 0; |
| 802 | } |
| 803 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 804 | static void omap_i2c_receive_data(struct omap_i2c_dev *dev, u8 num_bytes, |
| 805 | bool is_rdr) |
| 806 | { |
| 807 | u16 w; |
| 808 | |
| 809 | while (num_bytes--) { |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 810 | w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG); |
| 811 | *dev->buf++ = w; |
| 812 | dev->buf_len--; |
| 813 | |
| 814 | /* |
| 815 | * Data reg in 2430, omap3 and |
| 816 | * omap4 is 8 bit wide |
| 817 | */ |
| 818 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 819 | *dev->buf++ = w >> 8; |
| 820 | dev->buf_len--; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 821 | } |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | static int omap_i2c_transmit_data(struct omap_i2c_dev *dev, u8 num_bytes, |
| 826 | bool is_xdr) |
| 827 | { |
| 828 | u16 w; |
| 829 | |
| 830 | while (num_bytes--) { |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 831 | w = *dev->buf++; |
| 832 | dev->buf_len--; |
| 833 | |
| 834 | /* |
| 835 | * Data reg in 2430, omap3 and |
| 836 | * omap4 is 8 bit wide |
| 837 | */ |
| 838 | if (dev->flags & OMAP_I2C_FLAG_16BIT_DATA_REG) { |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 839 | w |= *dev->buf++ << 8; |
| 840 | dev->buf_len--; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | if (dev->errata & I2C_OMAP_ERRATA_I462) { |
| 844 | int ret; |
| 845 | |
| 846 | ret = errata_omap3_i462(dev); |
| 847 | if (ret < 0) |
| 848 | return ret; |
| 849 | } |
| 850 | |
| 851 | omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w); |
| 852 | } |
| 853 | |
| 854 | return 0; |
| 855 | } |
| 856 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 857 | static irqreturn_t |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 858 | omap_i2c_isr(int irq, void *dev_id) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 859 | { |
| 860 | struct omap_i2c_dev *dev = dev_id; |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 861 | irqreturn_t ret = IRQ_HANDLED; |
| 862 | u16 mask; |
| 863 | u16 stat; |
| 864 | |
| 865 | spin_lock(&dev->lock); |
| 866 | mask = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); |
| 867 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 868 | |
| 869 | if (stat & mask) |
| 870 | ret = IRQ_WAKE_THREAD; |
| 871 | |
| 872 | spin_unlock(&dev->lock); |
| 873 | |
| 874 | return ret; |
| 875 | } |
| 876 | |
| 877 | static irqreturn_t |
| 878 | omap_i2c_isr_thread(int this_irq, void *dev_id) |
| 879 | { |
| 880 | struct omap_i2c_dev *dev = dev_id; |
| 881 | unsigned long flags; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 882 | u16 bits; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 883 | u16 stat; |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 884 | int err = 0, count = 0; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 885 | |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 886 | if (pm_runtime_suspended(dev->dev)) |
Tony Lindgren | f08ac4e | 2008-03-23 20:28:20 +0100 | [diff] [blame] | 887 | return IRQ_NONE; |
| 888 | |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 889 | spin_lock_irqsave(&dev->lock, flags); |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 890 | do { |
| 891 | bits = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG); |
| 892 | stat = omap_i2c_read_reg(dev, OMAP_I2C_STAT_REG); |
| 893 | stat &= bits; |
| 894 | |
Felipe Balbi | 079d8af | 2012-09-12 16:28:06 +0530 | [diff] [blame] | 895 | /* If we're in receiver mode, ignore XDR/XRDY */ |
| 896 | if (dev->receiver) |
| 897 | stat &= ~(OMAP_I2C_STAT_XDR | OMAP_I2C_STAT_XRDY); |
| 898 | else |
| 899 | stat &= ~(OMAP_I2C_STAT_RDR | OMAP_I2C_STAT_RRDY); |
| 900 | |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 901 | if (!stat) { |
| 902 | /* my work here is done */ |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 903 | spin_unlock_irqrestore(&dev->lock, flags); |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 904 | return IRQ_HANDLED; |
| 905 | } |
| 906 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 907 | dev_dbg(dev->dev, "IRQ (ISR = 0x%04x)\n", stat); |
| 908 | if (count++ == 100) { |
| 909 | dev_warn(dev->dev, "Too much work in one IRQ\n"); |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 910 | goto out; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 911 | } |
| 912 | |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 913 | if (stat & OMAP_I2C_STAT_NACK) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 914 | err |= OMAP_I2C_STAT_NACK; |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 915 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_NACK); |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 916 | goto out; |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 917 | } |
Jan Weitzel | 78e1cf4 | 2011-12-07 11:50:16 -0800 | [diff] [blame] | 918 | |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 919 | if (stat & OMAP_I2C_STAT_AL) { |
| 920 | dev_err(dev->dev, "Arbitration lost\n"); |
| 921 | err |= OMAP_I2C_STAT_AL; |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 922 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_AL); |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 923 | goto out; |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 924 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 925 | |
Ben Dooks | a5a595c | 2011-02-23 00:43:55 +0000 | [diff] [blame] | 926 | /* |
Richard woodruff | cb527ed | 2011-02-16 10:24:16 +0530 | [diff] [blame] | 927 | * ProDB0017052: Clear ARDY bit twice |
Ben Dooks | a5a595c | 2011-02-23 00:43:55 +0000 | [diff] [blame] | 928 | */ |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 929 | if (stat & (OMAP_I2C_STAT_ARDY | OMAP_I2C_STAT_NACK | |
Sonasath, Moiz | 04c688d | 2009-07-21 10:14:40 -0500 | [diff] [blame] | 930 | OMAP_I2C_STAT_AL)) { |
Felipe Balbi | 540a479 | 2012-09-12 16:27:59 +0530 | [diff] [blame] | 931 | omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY | |
| 932 | OMAP_I2C_STAT_RDR | |
| 933 | OMAP_I2C_STAT_XRDY | |
| 934 | OMAP_I2C_STAT_XDR | |
| 935 | OMAP_I2C_STAT_ARDY)); |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 936 | goto out; |
Sonasath, Moiz | 04c688d | 2009-07-21 10:14:40 -0500 | [diff] [blame] | 937 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 938 | |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 939 | if (stat & OMAP_I2C_STAT_RDR) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 940 | u8 num_bytes = 1; |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 941 | |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 942 | if (dev->fifo_size) |
| 943 | num_bytes = dev->buf_len; |
manjugk manjugk | f3083d9 | 2010-05-11 11:35:20 -0700 | [diff] [blame] | 944 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 945 | omap_i2c_receive_data(dev, num_bytes, true); |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 946 | |
| 947 | if (dev->errata & I2C_OMAP_ERRATA_I207) |
| 948 | i2c_omap_errata_i207(dev, stat); |
| 949 | |
| 950 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 951 | continue; |
| 952 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 953 | |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 954 | if (stat & OMAP_I2C_STAT_RRDY) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 955 | u8 num_bytes = 1; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 956 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 957 | if (dev->threshold) |
| 958 | num_bytes = dev->threshold; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 959 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 960 | omap_i2c_receive_data(dev, num_bytes, false); |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 961 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY); |
| 962 | continue; |
| 963 | } |
| 964 | |
| 965 | if (stat & OMAP_I2C_STAT_XDR) { |
| 966 | u8 num_bytes = 1; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 967 | int ret; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 968 | |
| 969 | if (dev->fifo_size) |
| 970 | num_bytes = dev->buf_len; |
| 971 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 972 | ret = omap_i2c_transmit_data(dev, num_bytes, true); |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 973 | if (ret < 0) |
Felipe Balbi | b07be0f | 2012-09-12 16:28:11 +0530 | [diff] [blame] | 974 | goto out; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 975 | |
| 976 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XDR); |
| 977 | continue; |
| 978 | } |
| 979 | |
| 980 | if (stat & OMAP_I2C_STAT_XRDY) { |
| 981 | u8 num_bytes = 1; |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 982 | int ret; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 983 | |
Felipe Balbi | dd74548 | 2012-09-12 16:28:10 +0530 | [diff] [blame] | 984 | if (dev->threshold) |
| 985 | num_bytes = dev->threshold; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 986 | |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 987 | ret = omap_i2c_transmit_data(dev, num_bytes, false); |
Felipe Balbi | 3312d25 | 2012-09-12 16:28:02 +0530 | [diff] [blame] | 988 | if (ret < 0) |
Felipe Balbi | b07be0f | 2012-09-12 16:28:11 +0530 | [diff] [blame] | 989 | goto out; |
Felipe Balbi | 6d9939f | 2012-09-12 16:28:00 +0530 | [diff] [blame] | 990 | |
| 991 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 992 | continue; |
| 993 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 994 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 995 | if (stat & OMAP_I2C_STAT_ROVR) { |
| 996 | dev_err(dev->dev, "Receive overrun\n"); |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 997 | err |= OMAP_I2C_STAT_ROVR; |
| 998 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_ROVR); |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 999 | goto out; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1000 | } |
Felipe Balbi | c55edb9 | 2012-09-12 16:27:58 +0530 | [diff] [blame] | 1001 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1002 | if (stat & OMAP_I2C_STAT_XUDF) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1003 | dev_err(dev->dev, "Transmit underflow\n"); |
Felipe Balbi | 1d7afc9 | 2012-09-12 16:28:04 +0530 | [diff] [blame] | 1004 | err |= OMAP_I2C_STAT_XUDF; |
| 1005 | omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XUDF); |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 1006 | goto out; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1007 | } |
Felipe Balbi | 66b9298 | 2012-09-12 16:28:03 +0530 | [diff] [blame] | 1008 | } while (stat); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1009 | |
Felipe Balbi | 4a7ec4e | 2012-09-12 16:28:09 +0530 | [diff] [blame] | 1010 | out: |
| 1011 | omap_i2c_complete_cmd(dev, err); |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 1012 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1013 | |
Felipe Balbi | 6a85ced | 2012-09-12 16:28:08 +0530 | [diff] [blame] | 1014 | return IRQ_HANDLED; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1015 | } |
| 1016 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 1017 | static const struct i2c_algorithm omap_i2c_algo = { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1018 | .master_xfer = omap_i2c_xfer, |
| 1019 | .functionality = omap_i2c_func, |
| 1020 | }; |
| 1021 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1022 | #ifdef CONFIG_OF |
| 1023 | static struct omap_i2c_bus_platform_data omap3_pdata = { |
| 1024 | .rev = OMAP_I2C_IP_VERSION_1, |
| 1025 | .flags = OMAP_I2C_FLAG_APPLY_ERRATA_I207 | |
| 1026 | OMAP_I2C_FLAG_RESET_REGS_POSTIDLE | |
| 1027 | OMAP_I2C_FLAG_BUS_SHIFT_2, |
| 1028 | }; |
| 1029 | |
| 1030 | static struct omap_i2c_bus_platform_data omap4_pdata = { |
| 1031 | .rev = OMAP_I2C_IP_VERSION_2, |
| 1032 | }; |
| 1033 | |
| 1034 | static const struct of_device_id omap_i2c_of_match[] = { |
| 1035 | { |
| 1036 | .compatible = "ti,omap4-i2c", |
| 1037 | .data = &omap4_pdata, |
| 1038 | }, |
| 1039 | { |
| 1040 | .compatible = "ti,omap3-i2c", |
| 1041 | .data = &omap3_pdata, |
| 1042 | }, |
| 1043 | { }, |
| 1044 | }; |
| 1045 | MODULE_DEVICE_TABLE(of, omap_i2c_of_match); |
| 1046 | #endif |
| 1047 | |
Uwe Kleine-König | 1139aea | 2010-02-04 20:56:53 +0100 | [diff] [blame] | 1048 | static int __devinit |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1049 | omap_i2c_probe(struct platform_device *pdev) |
| 1050 | { |
| 1051 | struct omap_i2c_dev *dev; |
| 1052 | struct i2c_adapter *adap; |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1053 | struct resource *mem; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 1054 | struct omap_i2c_bus_platform_data *pdata = pdev->dev.platform_data; |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1055 | struct device_node *node = pdev->dev.of_node; |
| 1056 | const struct of_device_id *match; |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1057 | int irq; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1058 | int r; |
| 1059 | |
| 1060 | /* NOTE: driver uses the static register mapping */ |
| 1061 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1062 | if (!mem) { |
| 1063 | dev_err(&pdev->dev, "no mem resource?\n"); |
| 1064 | return -ENODEV; |
| 1065 | } |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1066 | |
| 1067 | irq = platform_get_irq(pdev, 0); |
| 1068 | if (irq < 0) { |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1069 | dev_err(&pdev->dev, "no irq resource?\n"); |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1070 | return irq; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1071 | } |
| 1072 | |
Felipe Balbi | d9ebd04 | 2012-09-12 16:27:55 +0530 | [diff] [blame] | 1073 | dev = devm_kzalloc(&pdev->dev, sizeof(struct omap_i2c_dev), GFP_KERNEL); |
| 1074 | if (!dev) { |
| 1075 | dev_err(&pdev->dev, "Menory allocation failed\n"); |
| 1076 | return -ENOMEM; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1077 | } |
| 1078 | |
Felipe Balbi | d9ebd04 | 2012-09-12 16:27:55 +0530 | [diff] [blame] | 1079 | dev->base = devm_request_and_ioremap(&pdev->dev, mem); |
| 1080 | if (!dev->base) { |
| 1081 | dev_err(&pdev->dev, "I2C region already claimed\n"); |
| 1082 | return -ENOMEM; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1083 | } |
| 1084 | |
Cousson, Benoit | 6c5aa40 | 2012-01-20 16:55:04 +0100 | [diff] [blame] | 1085 | match = of_match_device(of_match_ptr(omap_i2c_of_match), &pdev->dev); |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1086 | if (match) { |
| 1087 | u32 freq = 100000; /* default to 100000 Hz */ |
| 1088 | |
| 1089 | pdata = match->data; |
| 1090 | dev->dtrev = pdata->rev; |
| 1091 | dev->flags = pdata->flags; |
| 1092 | |
| 1093 | of_property_read_u32(node, "clock-frequency", &freq); |
| 1094 | /* convert DT freq value in Hz into kHz for speed */ |
| 1095 | dev->speed = freq / 1000; |
| 1096 | } else if (pdata != NULL) { |
| 1097 | dev->speed = pdata->clkrate; |
| 1098 | dev->flags = pdata->flags; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 1099 | dev->set_mpu_wkup_lat = pdata->set_mpu_wkup_lat; |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1100 | dev->dtrev = pdata->rev; |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 1101 | } |
Syed Mohammed Khasim | 4574eb6 | 2008-11-21 13:39:45 -0800 | [diff] [blame] | 1102 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1103 | dev->dev = &pdev->dev; |
Felipe Balbi | ac79e4b | 2012-09-12 16:28:05 +0530 | [diff] [blame] | 1104 | dev->irq = irq; |
Russell King | 55c381e | 2008-09-04 14:07:22 +0100 | [diff] [blame] | 1105 | |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 1106 | spin_lock_init(&dev->lock); |
| 1107 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1108 | platform_set_drvdata(pdev, dev); |
Shubhrajyoti D | 0e33bbb | 2012-06-28 20:41:29 +0530 | [diff] [blame] | 1109 | init_completion(&dev->cmd_complete); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1110 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1111 | dev->reg_shift = (dev->flags >> OMAP_I2C_FLAG_BUS_SHIFT__SHIFT) & 3; |
Mika Westerberg | 7c6bd20 | 2010-03-23 12:12:56 +0200 | [diff] [blame] | 1112 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1113 | if (dev->dtrev == OMAP_I2C_IP_VERSION_2) |
Andy Green | a129557 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 1114 | dev->regs = (u8 *)reg_map_ip_v2; |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 1115 | else |
Andy Green | a129557 | 2011-05-30 07:43:06 -0700 | [diff] [blame] | 1116 | dev->regs = (u8 *)reg_map_ip_v1; |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 1117 | |
Kevin Hilman | 7f4b08e | 2011-05-17 16:31:37 +0200 | [diff] [blame] | 1118 | pm_runtime_enable(dev->dev); |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1119 | r = pm_runtime_get_sync(dev->dev); |
| 1120 | if (IS_ERR_VALUE(r)) |
| 1121 | goto err_free_mem; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1122 | |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 1123 | dev->rev = omap_i2c_read_reg(dev, OMAP_I2C_REV_REG) & 0xff; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1124 | |
Tasslehoff Kjappfot | 9aa8ec6 | 2012-05-29 16:26:20 +0530 | [diff] [blame] | 1125 | dev->errata = 0; |
| 1126 | |
| 1127 | if (dev->flags & OMAP_I2C_FLAG_APPLY_ERRATA_I207) |
| 1128 | dev->errata |= I2C_OMAP_ERRATA_I207; |
| 1129 | |
Jon Hunter | f518b48 | 2012-06-28 20:41:31 +0530 | [diff] [blame] | 1130 | if (dev->rev <= OMAP_I2C_REV_ON_3430_3530) |
Shubhrajyoti D | c8db38f | 2012-05-29 16:26:22 +0530 | [diff] [blame] | 1131 | dev->errata |= I2C_OMAP_ERRATA_I462; |
manjugk manjugk | 8a9d97d | 2010-05-11 11:35:23 -0700 | [diff] [blame] | 1132 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1133 | if (!(dev->flags & OMAP_I2C_FLAG_NO_FIFO)) { |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1134 | u16 s; |
| 1135 | |
| 1136 | /* Set up the fifo size - Get total size */ |
| 1137 | s = (omap_i2c_read_reg(dev, OMAP_I2C_BUFSTAT_REG) >> 14) & 0x3; |
| 1138 | dev->fifo_size = 0x8 << s; |
| 1139 | |
| 1140 | /* |
| 1141 | * Set up notification threshold as half the total available |
| 1142 | * size. This is to ensure that we can handle the status on int |
| 1143 | * call back latencies. |
| 1144 | */ |
Shubhrajyoti D | 1d5a34f | 2011-12-06 10:25:58 -0800 | [diff] [blame] | 1145 | |
| 1146 | dev->fifo_size = (dev->fifo_size / 2); |
| 1147 | |
Felipe Balbi | 3ff4443 | 2012-09-12 16:28:07 +0530 | [diff] [blame] | 1148 | if (dev->rev < OMAP_I2C_REV_ON_3630_4430) |
Santosh Shilimkar | f38e66e | 2010-05-11 11:35:04 -0700 | [diff] [blame] | 1149 | dev->b_hw = 1; /* Enable hardware fixes */ |
Shubhrajyoti D | 1d5a34f | 2011-12-06 10:25:58 -0800 | [diff] [blame] | 1150 | |
Kalle Jokiniemi | 20c9d2c | 2010-05-11 11:35:08 -0700 | [diff] [blame] | 1151 | /* calculate wakeup latency constraint for MPU */ |
| 1152 | if (dev->set_mpu_wkup_lat != NULL) |
| 1153 | dev->latency = (1000000 * dev->fifo_size) / |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1154 | (1000 * dev->speed / 8); |
Nishanth Menon | b6ee52c | 2008-11-21 13:39:46 -0800 | [diff] [blame] | 1155 | } |
| 1156 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1157 | /* reset ASAP, clearing any IRQs */ |
| 1158 | omap_i2c_init(dev); |
| 1159 | |
Felipe Balbi | 3b2f8f8 | 2012-09-12 16:28:13 +0530 | [diff] [blame^] | 1160 | if (dev->rev < OMAP_I2C_OMAP1_REV_2) |
| 1161 | r = devm_request_irq(&pdev->dev, dev->irq, omap_i2c_omap1_isr, |
| 1162 | IRQF_NO_SUSPEND, pdev->name, dev); |
| 1163 | else |
| 1164 | r = devm_request_threaded_irq(&pdev->dev, dev->irq, |
| 1165 | omap_i2c_isr, omap_i2c_isr_thread, |
| 1166 | IRQF_NO_SUSPEND | IRQF_ONESHOT, |
| 1167 | pdev->name, dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1168 | |
| 1169 | if (r) { |
| 1170 | dev_err(dev->dev, "failure requesting irq %i\n", dev->irq); |
| 1171 | goto err_unuse_clocks; |
| 1172 | } |
Paul Walmsley | 9c76b87 | 2008-11-21 13:39:55 -0800 | [diff] [blame] | 1173 | |
Andy Green | 9550d4d | 2011-05-30 07:43:10 -0700 | [diff] [blame] | 1174 | dev_info(dev->dev, "bus %d rev%d.%d.%d at %d kHz\n", pdev->id, |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1175 | dev->dtrev, dev->rev >> 4, dev->rev & 0xf, dev->speed); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1176 | |
| 1177 | adap = &dev->adapter; |
| 1178 | i2c_set_adapdata(adap, dev); |
| 1179 | adap->owner = THIS_MODULE; |
| 1180 | adap->class = I2C_CLASS_HWMON; |
Roel Kluin | 783fd6f | 2009-07-17 15:24:00 +0200 | [diff] [blame] | 1181 | strlcpy(adap->name, "OMAP I2C adapter", sizeof(adap->name)); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1182 | adap->algo = &omap_i2c_algo; |
| 1183 | adap->dev.parent = &pdev->dev; |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1184 | adap->dev.of_node = pdev->dev.of_node; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1185 | |
| 1186 | /* i2c device drivers may be active on return from add_adapter() */ |
David Brownell | 7c17549 | 2007-05-01 23:26:32 +0200 | [diff] [blame] | 1187 | adap->nr = pdev->id; |
| 1188 | r = i2c_add_numbered_adapter(adap); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1189 | if (r) { |
| 1190 | dev_err(dev->dev, "failure adding adapter\n"); |
Felipe Balbi | d9ebd04 | 2012-09-12 16:27:55 +0530 | [diff] [blame] | 1191 | goto err_unuse_clocks; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1192 | } |
| 1193 | |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1194 | of_i2c_register_devices(adap); |
| 1195 | |
Shubhrajyoti D | 62ff2c2 | 2012-05-29 16:26:16 +0530 | [diff] [blame] | 1196 | pm_runtime_put(dev->dev); |
| 1197 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1198 | return 0; |
| 1199 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1200 | err_unuse_clocks: |
Tony Lindgren | 3e39752 | 2008-01-14 21:53:30 +0100 | [diff] [blame] | 1201 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1202 | pm_runtime_put(dev->dev); |
Shubhrajyoti D | 2474051 | 2012-05-29 16:26:14 +0530 | [diff] [blame] | 1203 | pm_runtime_disable(&pdev->dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1204 | err_free_mem: |
| 1205 | platform_set_drvdata(pdev, NULL); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1206 | |
| 1207 | return r; |
| 1208 | } |
| 1209 | |
Shubhrajyoti D | d790aea | 2012-06-28 20:41:27 +0530 | [diff] [blame] | 1210 | static int __devexit omap_i2c_remove(struct platform_device *pdev) |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1211 | { |
| 1212 | struct omap_i2c_dev *dev = platform_get_drvdata(pdev); |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1213 | int ret; |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1214 | |
| 1215 | platform_set_drvdata(pdev, NULL); |
| 1216 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1217 | i2c_del_adapter(&dev->adapter); |
Shubhrajyoti D | 3b0fb97 | 2012-05-29 16:26:19 +0530 | [diff] [blame] | 1218 | ret = pm_runtime_get_sync(&pdev->dev); |
| 1219 | if (IS_ERR_VALUE(ret)) |
| 1220 | return ret; |
| 1221 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1222 | omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, 0); |
Shubhrajyoti D | 0861f43 | 2012-05-29 16:26:18 +0530 | [diff] [blame] | 1223 | pm_runtime_put(&pdev->dev); |
Shubhrajyoti D | 2474051 | 2012-05-29 16:26:14 +0530 | [diff] [blame] | 1224 | pm_runtime_disable(&pdev->dev); |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1225 | return 0; |
| 1226 | } |
| 1227 | |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1228 | #ifdef CONFIG_PM |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1229 | #ifdef CONFIG_PM_RUNTIME |
| 1230 | static int omap_i2c_runtime_suspend(struct device *dev) |
| 1231 | { |
| 1232 | struct platform_device *pdev = to_platform_device(dev); |
| 1233 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1234 | u16 iv; |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1235 | |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1236 | _dev->iestate = omap_i2c_read_reg(_dev, OMAP_I2C_IE_REG); |
Shubhrajyoti D | bd16c82 | 2012-05-29 16:26:15 +0530 | [diff] [blame] | 1237 | |
| 1238 | omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, 0); |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1239 | |
| 1240 | if (_dev->rev < OMAP_I2C_OMAP1_REV_2) { |
| 1241 | iv = omap_i2c_read_reg(_dev, OMAP_I2C_IV_REG); /* Read clears */ |
| 1242 | } else { |
| 1243 | omap_i2c_write_reg(_dev, OMAP_I2C_STAT_REG, _dev->iestate); |
| 1244 | |
| 1245 | /* Flush posted write */ |
| 1246 | omap_i2c_read_reg(_dev, OMAP_I2C_STAT_REG); |
| 1247 | } |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1248 | |
| 1249 | return 0; |
| 1250 | } |
| 1251 | |
| 1252 | static int omap_i2c_runtime_resume(struct device *dev) |
| 1253 | { |
| 1254 | struct platform_device *pdev = to_platform_device(dev); |
| 1255 | struct omap_i2c_dev *_dev = platform_get_drvdata(pdev); |
| 1256 | |
Shubhrajyoti D | 3dae3ef | 2012-05-29 16:26:13 +0530 | [diff] [blame] | 1257 | if (_dev->flags & OMAP_I2C_FLAG_RESET_REGS_POSTIDLE) { |
| 1258 | omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, 0); |
| 1259 | omap_i2c_write_reg(_dev, OMAP_I2C_PSC_REG, _dev->pscstate); |
| 1260 | omap_i2c_write_reg(_dev, OMAP_I2C_SCLL_REG, _dev->scllstate); |
| 1261 | omap_i2c_write_reg(_dev, OMAP_I2C_SCLH_REG, _dev->sclhstate); |
| 1262 | omap_i2c_write_reg(_dev, OMAP_I2C_BUF_REG, _dev->bufstate); |
| 1263 | omap_i2c_write_reg(_dev, OMAP_I2C_SYSC_REG, _dev->syscstate); |
| 1264 | omap_i2c_write_reg(_dev, OMAP_I2C_WE_REG, _dev->westate); |
| 1265 | omap_i2c_write_reg(_dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN); |
| 1266 | } |
| 1267 | |
| 1268 | /* |
| 1269 | * Don't write to this register if the IE state is 0 as it can |
| 1270 | * cause deadlock. |
| 1271 | */ |
| 1272 | if (_dev->iestate) |
| 1273 | omap_i2c_write_reg(_dev, OMAP_I2C_IE_REG, _dev->iestate); |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1274 | |
| 1275 | return 0; |
| 1276 | } |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1277 | #endif /* CONFIG_PM_RUNTIME */ |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1278 | |
| 1279 | static struct dev_pm_ops omap_i2c_pm_ops = { |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1280 | SET_RUNTIME_PM_OPS(omap_i2c_runtime_suspend, |
| 1281 | omap_i2c_runtime_resume, NULL) |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1282 | }; |
| 1283 | #define OMAP_I2C_PM_OPS (&omap_i2c_pm_ops) |
| 1284 | #else |
| 1285 | #define OMAP_I2C_PM_OPS NULL |
Shubhrajyoti D | 5692d2a | 2012-06-28 20:41:28 +0530 | [diff] [blame] | 1286 | #endif /* CONFIG_PM */ |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1287 | |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1288 | static struct platform_driver omap_i2c_driver = { |
| 1289 | .probe = omap_i2c_probe, |
Shubhrajyoti D | d790aea | 2012-06-28 20:41:27 +0530 | [diff] [blame] | 1290 | .remove = __devexit_p(omap_i2c_remove), |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1291 | .driver = { |
Benoit Cousson | f7bb0d9 | 2010-12-09 14:24:16 +0000 | [diff] [blame] | 1292 | .name = "omap_i2c", |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1293 | .owner = THIS_MODULE, |
Kevin Hilman | fab67af | 2011-05-17 16:31:38 +0200 | [diff] [blame] | 1294 | .pm = OMAP_I2C_PM_OPS, |
Benoit Cousson | 6145197 | 2011-12-22 15:56:36 +0100 | [diff] [blame] | 1295 | .of_match_table = of_match_ptr(omap_i2c_of_match), |
Komal Shah | 010d442c4 | 2006-08-13 23:44:09 +0200 | [diff] [blame] | 1296 | }, |
| 1297 | }; |
| 1298 | |
| 1299 | /* I2C may be needed to bring up other drivers */ |
| 1300 | static int __init |
| 1301 | omap_i2c_init_driver(void) |
| 1302 | { |
| 1303 | return platform_driver_register(&omap_i2c_driver); |
| 1304 | } |
| 1305 | subsys_initcall(omap_i2c_init_driver); |
| 1306 | |
| 1307 | static void __exit omap_i2c_exit_driver(void) |
| 1308 | { |
| 1309 | platform_driver_unregister(&omap_i2c_driver); |
| 1310 | } |
| 1311 | module_exit(omap_i2c_exit_driver); |
| 1312 | |
| 1313 | MODULE_AUTHOR("MontaVista Software, Inc. (and others)"); |
| 1314 | MODULE_DESCRIPTION("TI OMAP I2C bus adapter"); |
| 1315 | MODULE_LICENSE("GPL"); |
Benoit Cousson | f7bb0d9 | 2010-12-09 14:24:16 +0000 | [diff] [blame] | 1316 | MODULE_ALIAS("platform:omap_i2c"); |